qemu: Add support for HyperV Enlightenment feature "relaxed"

This patch adds QEMU support for the "relaxed" feature implemented by
previous patch.

src/qemu/qemu_command.c

@@ -4238,6 +4238,26 @@ qemuBuildCpuArgStr(const struct qemud_driver *driver,
         have_cpu = true;
     }
 
+    if (def->features & (1 << VIR_DOMAIN_FEATURE_HYPERV)) {
+        if (!have_cpu) {
+            virBufferAdd(&buf, default_model, -1);
+            have_cpu = true;
+        }
+
+        for (i = 0; i < VIR_DOMAIN_HYPERV_LAST; i++) {
+            switch ((enum virDomainHyperv) i) {
+            case VIR_DOMAIN_HYPERV_RELAXED:
+                if (def->hyperv_features[i] == VIR_DOMAIN_FEATURE_STATE_ON)
+                    virBufferAsprintf(&buf, ",hv_%s",
+                                      virDomainHypervTypeToString(i));
+                break;
+
+            case VIR_DOMAIN_HYPERV_LAST:
+                break;
+            }
+        }
+    }
+
     if (virBufferError(&buf))
         goto no_memory;
 
@@ -7708,8 +7728,7 @@ qemuParseCommandLineCPU(virDomainDefPtr dom,
                 cpu->model = model;
                 model = NULL;
             }
-        }
-        else if (*p == '+' || *p == '-') {
+        } else if (*p == '+' || *p == '-') {
             char *feature;
             int policy;
             int ret = 0;
@@ -7779,6 +7798,41 @@ qemuParseCommandLineCPU(virDomainDefPtr dom,
             VIR_FREE(feature);
             if (ret < 0)
                 goto error;
+        } else if (STRPREFIX(p, "hv_")) {
+            char *feature;
+            int f;
+            p += 3; /* "hv_" */
+
+            if (*p == '\0' || *p == ',')
+                goto syntax;
+
+            if (next)
+                feature = strndup(p, next - p - 1);
+            else
+                feature = strdup(p);
+
+            if (!feature)
+                goto no_memory;
+
+            dom->features |= (1 << VIR_DOMAIN_FEATURE_HYPERV);
+
+            if ((f = virDomainHypervTypeFromString(feature)) < 0) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                               _("unsupported HyperV Enlightenment feature "
+                                 "'%s'"), feature);
+                goto error;
+            }
+
+            switch ((enum virDomainHyperv) f) {
+            case VIR_DOMAIN_HYPERV_RELAXED:
+                dom->hyperv_features[f] = VIR_DOMAIN_FEATURE_STATE_ON;
+                break;
+
+            case VIR_DOMAIN_HYPERV_LAST:
+                break;
+            }
+
+            VIR_FREE(feature);
         }
     } while ((p = next));
 

tests/qemuargv2xmltest.c

@@ -241,6 +241,8 @@ mymain(void)
 
     DO_TEST("smp");
 
+    DO_TEST("hyperv");
+
     DO_TEST_FULL("restore-v1", 0, "stdio");
     DO_TEST_FULL("restore-v2", 0, "stdio");
     DO_TEST_FULL("restore-v2", 0, "exec:cat");

tests/qemuxml2argvdata/qemuxml2argv-hyperv.args

@@ -0,0 +1,4 @@
+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test /usr/bin/qemu -S -M pc \
+-cpu qemu32,hv_relaxed -m 214 -smp 6 -nographic -monitor \
+unix:/tmp/test-monitor,server,nowait -boot n -net none -serial none \
+-parallel none -usb

tests/qemuxml2argvdata/qemuxml2argv-hyperv.xml

@@ -0,0 +1,26 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219100</memory>
+  <currentMemory unit='KiB'>219100</currentMemory>
+  <vcpu placement='static'>6</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='network'/>
+  </os>
+  <features>
+    <acpi/>
+    <hyperv>
+      <relaxed state='on'/>
+    </hyperv>
+  </features>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu</emulator>
+    <controller type='usb' index='0'/>
+    <memballoon model='virtio'/>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -412,6 +412,8 @@ mymain(void)
     DO_TEST("eoi-enabled", NONE);
     DO_TEST("kvmclock+eoi-disabled", QEMU_CAPS_ENABLE_KVM);
 
+    DO_TEST("hyperv", NONE);
+
     DO_TEST("hugepages", QEMU_CAPS_MEM_PATH);
     DO_TEST("disk-cdrom", NONE);
     DO_TEST("disk-cdrom-empty", QEMU_CAPS_DRIVE);

tests/qemuxml2xmltest.c

@@ -150,6 +150,8 @@ mymain(void)
     DO_TEST("eoi-disabled");
     DO_TEST("eoi-enabled");
 
+    DO_TEST("hyperv");
+
     DO_TEST("hugepages");
     DO_TEST("disk-aio");
     DO_TEST("disk-cdrom");